well, in keeping with what moonpi said, the angel would have to travel to mars to mail their package to keep their hometown a secret, since the post office does postmark them and we know how to read. how 'anonymous' can that be? if my package said central new jersey everyone with eyes would know who i was.
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In another club (non quilting) I send my secret sister cards and presents by
sending them first to family who live far away, and unkown to them friends who travel a lot and can drop them off where they land!! Plus, there are online places that will forward letters if they are sent in an enclosed letter with a couple of dollars inside it. Haven't done that for 4 or 5 years, but it did work
well for me for one year, my SS was wild to figure out who was doing that!!